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fix (gNB RRC): skip CU-UP notify on re-estab without DRBs

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Avoid E1 bearer modification when the UE has no DRBs left (e.g. after PDU
session release). (TS 38.331 clause 5.3.5.6.5 DRB with reestablishPDCP)

Changes:
- cuup_notify_reestablishment(): return early if drbs is empty

Fixes: #148

Signed-off-by: Guido Casati <guido.casati@openairinterface.org>
This commit is contained in:
Guido Casati
2026-06-11 17:40:05 +02:00
parent f79f5087e5
commit cb9dab74e3
1 changed files with 6 additions and 3 deletions
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9
openair2/RRC/NR/rrc_gNB.c
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@@ -1092,9 +1092,8 @@ static DRB_nGRAN_to_mod_t get_e1_drb_mod_reestablishment(const drb_t *drb, const
return drb_e1;
}
/**
* @brief Notify E1 re-establishment to CU-UP
*/
/** @brief Re-establish DRB PDCP on CU-UP (TS 38.331 clause 5.3.5.6.5, TS 38.463 bearer mod).
* Sends pDCP_Reestablishment and updated KUP keys after KgNB derivation. */
static void cuup_notify_reestablishment(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue_p)
{
// Quit if no CU-UP is associated
@@ -1102,6 +1101,10 @@ static void cuup_notify_reestablishment(gNB_RRC_INST *rrc, gNB_RRC_UE_t *ue_p)
return;
}
/* TS 38.331 §5.3.5.6.5: no DRB/PDU session (e.g. after release) means nothing to do. */
if (seq_arr_size(&ue_p->drbs) == 0)
return;
e1ap_bearer_mod_req_t req = {
.gNB_cu_cp_ue_id = ue_p->rrc_ue_id,
.gNB_cu_up_ue_id = ue_p->rrc_ue_id,